large amount of events speedup: (most important) DbHelper.readEvent: do not sub-query if already read, DbHelper.getEvents: slightly less object allocations
settings black only for buggy v 2,
loading shows standard dialog (not focusable),
larger supertitle (small style),
light action bar,
ability for fade-in animation (buggy, disabled),
safer loading re-entrance: abort before UI update if canceled,
slight refactoring of CreateEvent<T> to template pattern,
BUG FIX: events are not deleted on No button in confirmation dialog,
displaying number of deleted events in "delete before",
displaying toasts on preferences actions,